Every OTA self-update and every ISO capture was implicitly relying on
/opt/archipelago/web-ui/aiui/ already being present on disk. Any node that
had its web-ui directory atomically swapped (for example by a manual
deployment shipping only neode-ui dist output) lost aiui entirely and the
AI Assistant tab fell through to the "needs to be enabled" placeholder.
self-update.sh: drop the rsync --exclude aiui preservation trick and
instead stage demo/aiui into the freshly-built dist tree before rsync.
demo/aiui in the repo is now the source of truth; every update overwrites
the on-disk copy with a matching version rather than carrying forward
whatever stale bundle happened to survive.
build-auto-installer-iso.sh: prepend demo/aiui to the AIUI search list so
ISO builds from a fresh repo clone pick it up automatically, without
requiring a side-checkout of the AIUI project or a live dev server.
This matches create-release-manifest.sh which already bakes demo/aiui
into the release tarball (lines 86-89).
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